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- Forest fires--Prevention and control 2
- Forests and forestry 2
- Airplanes 1
- Capes (Coasts) 1
- Coasts--Oregon 1
- Log transportation 1
- Logging trucks 1
- Lumber trade 1
- Mazamas (Portland, Or.) 1
- Mountaineering 1
- Mountains--Oregon 1
- United States. National Aeronautics and Space Administration 1
- Volcanic ash, tuff, etc 1